Vancouver Audio Speaker Clinic
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I've done surgery on about a dozen pairs of speakers by simply upgrading the crossover components and wiring.
First, do only one speaker at a time so that you can look at the untouched crossover for reference in case you get lost. I sketch a diagram of the crossover components I am replacing and the wiring to the drivers. I also photograph the crossover before touching anything.
Then I order my caps to match the values of the original. Upgraded caps are oft much larger physically, so you need to purchase them with long leads so you can physically fit them on the board. Replacement wiring needs to be the same diameter to fit through original holes in the crossover board, so don't go nuts purchasing large awg that won't work.
When all of the pieces are received, solder off the old parts of the crossover to be replaced and reassemble with upgraded. Test drive the speaker to make sure it works before doing the second. Good luck
Sorry to be a downer but I wouldn't spend any money to upgrade your 104.2s. I believe putting new crossovers and drivers in them changes these wonderful speakers. My pair of 104.2s are 29 years old, I purchased them new, they finally gave out and I couldn't find any original replacement parts. I can't complain since I did enjoy them for many years.